$c-1: #000
$c-2: red
$c-3: #ccc
$w: #fff
$b: 1px solid $c-1

*
  margin: 0
  padding: 0
li
  list-style: none
a
  text-decoration: none
.ground
  width: 808px
  height: 404px
  border-right: $b
  border-top: $b
  li
    width: 80px
    height: 80px
    border-left: $b
    border-bottom: $b
    float: left
    text-align: center
    padding: 10px
    a
      width: 100%
      height: 80px
      line-height: 80px
      border-radius: 50%
      display: block
      font-size: 30px
.chass_a
  color: $c-3
  border: 1px solid $c-3
.chass_b
  color: $c-2
  border: 1px solid $c-2
.chass_d
  color: $w
  border: 1px solid $c-2
  background: $c-2
.chass_c
  color: $c-1
  border: 1px solid $c-1
.chass_e
  color: $w
  border: 1px solid $c-1
  background: $c-1
